mean mug: it is when you intensely stare someone down for a long-shorrt amount of time with your car window slightly rolled dowwn as if you are a black man hunting for a bucket of chicken or a house to rob but you are staring at a person

The sexual act during which the provider of oral stimulation momentarily removes the penis from her/his mouth to glare at it as though they are angry at, or absolutely loathe said penis. The stare down is completed when she/he spits on the penis and continues the fellatio in a vigorous manner.

"hey bobby, check out this hot blowjob scene. I love it when she mean mugs that stud's cock"